Machine for forming internal grooves in gears, etc.



J. LAESSKER MACHINE FOR FORMING INTERNALGROOVES IN GEARS, ETC

Filed Aug. l, 1927 A M M M M .,...w.. m m Q, 6 Wn MH y@ w ,W ,MIHM,I|IM||HIIH.IH Ihhwm .w f E N Oct 9., 1928.

.of gears Which-require to be grooved inter-V lnatented et. 9, 192g.,

"fl STATES 1,687,253 PTEN'E? OFFEQE'.

JEAN LAESSEER, OF ARBON, SWITZERLAND, A.A-lSTtGrNOIt TO SOCIETE ANONYME AIOLPBIE SAUBER, 0F ARBON, SWITZERLAND, A CORPORATION OF SWITZER- LAND.

' MACHINE FOR FORMING INTER Application led August 1,

rllhis invention has for its object to provide a machine, mainly automatic in its operation, for the grindng of surfaces not readily accessible, such as the internal grooves nally for engagement with some part of the`A shaft on which the gears are mounted. There e has been devised heretofore a grinding tool for such purposes in which the grinding diSo is driven by a turbine or other fluid impelled Wheel and the present invention is particularly concerned with the means for support-v l Figure l ing and eil'ecting the necessary movements of such a grinding tool in a machine Which is automat-ic' in its character. l

The invention will be more fully explained hereinafter With reference to the accompanying drawing in Which it -is illustratedand in which:

Figure l is a View in elevation, partly in outline, of a machine constructed in accordance with the invention.

Figure 2 is a detail view, in sectional eley vation, of the grinding tool represented 'in ltigure 3 is a detail vieW of the change gears indicated conventionally in Figure l.

ln the embodiment of the invention illus trated in Figure l, the impelling'liquid by which the 'turbine driven tool is actuated, as indicated in Figure 2, is drawn by a een trifugal pump 2, driven by a motor l, from a reservoir 3 and is conducted to a suitable pipe Il to the holder a of the tool e', the p ipe l being provided-With telescopio and swivel joints so as to accommodate itself tothe movements of the holder a. f

The gearor other article to be subjected to the acton of the tool i is supported 'upon a 'Work table 5, the table being recessed and provided with a tube 6 through which the oil or other impell-ing liquid, after it has done its Work 'in driving the tool, may be returned to the tank or reservoir 3 for further circulation. The impelling liquid may thus have an influence in cooling thevtool during operation.

ln the operation of the machine shown, the tool'i has a movement in a vertical direction, that it may be introduced into and Witlr drawn fremthe bere of the gear or other article. lt may also have a movement in a' horiaental plane and in' a direction indicated by the plane of the drawing, for the N'AL GROOVES IN GEARS, ETC.

1927. Serial No. 209,657.

purpose of deepening the cut made by the tool, and it may also have, if desired, a move ment in a horizontal plane in a direction at right angles to the direction last mentioned.

The Work table 5 should also have a movement of rotation about a vertical axis in order that a plurality of grooves may be cut Without requiring the gear or other article to be released from the table, to which it may be secured by any usual or suitable means not necessary to be shown herein.

In the machine illustrated, provision is made for effecting automatically all of the movements above mentioned and the mechanical devices through which such movements are effected -Will now be described.

Through the vertical shaft 7, which may be driven from the motor shaft, movement of rotation is imparted to two parallel, hori zontal shafts 8 and 9, which may be interconnected by change gears 8a and 9a, as in dicated in Figure 3, so that the speed of the shaft 9, and the parts driven therefrom, may be regulated as desired. Through bevel Wheels l0', pinion 1l and gear l2, movement of rotation is imparted to a, cam disc which, through a `bell crank lll, link l5, adjustable by a screvvl?, gear segment 18 and-vertically sliding rack 19, heldin place by a cover 2O and screws 2l, effects the de# sired vertical movement of the holder a and tool z'. The throw of the gear segment and therefore the movement of the'tool i in a vertical direction may be regulated, as will be obvious, by means of the screw 17 which carries the block la to which the upper end of the link lfis connected.

T o permit lateral adjustment of the tool to be effected in a directior at right angles to the plane-of the draiting, the rack 19 and *i the cover 20 may be carried by a slide 22 capable of movement in the direction referr-ed to.

To effect movement of the tool 2f in the horizontal plane, in the direction indicated by the plane of the drawing, the head 23, on Which are supported'the gear segment 18 and the slide 22, is mounted' so as to slide in the desired direction on the frame 2a, being guided as indicated at 25. A lever 27 mounted on an adjustable fulcrum 26 secured to the iframe 9A, is connected at its upper end, as at 27a, to the head 23 and at its lower end, as at 27", and carries a roller ico for coaction with a cam 28 mounted' on the same shaft with the ear 12 and the cam disc 13, the bell crank ever .14 and the lever 27 being held in operative relation with the' cam discs 13 and 28 respectively, by any suitable means, such as the springs 14 and y 27c respectively.

It will be understood that for each rotation of the cam discs 13 and 28 the tool holder receives a complete up and down movement and a complete to and fro movement in the direction indicated. The horizontal movement of the tool in a direction at vright angles to the plane ofthe drawing is not designed to be automatic in the mal chine shown.

If a single groove is to be cut in the gear or other artic e, it is not necessary to provide for rotation of the work table, but in some cases a plurality of grooves may be' required. To effect this without detaching the gear from the'work table, the work table itself is arranged to receive a step by step rotation. 'The gear 12 is shown as carrying a stud 29 which is adapted to enter the radial ooves 30 of a disc suitably mounted on the rame and carrying on the same shaft a gear 31 which meshes with the corresponding gear 32. The latter carries a bevel gear 33, which in turn meshes with the bevel gear 34 on the hollow shaft 6 of the work table 5. Through such mechanism the work' table receives a one-third rotation for each complete rotation of the gear 12, thus providing :for the formation of three ooves. It is desirable, however, that during the be rotated throuofh one-third of a rotation While it is unlocred. v

ItA will be understood that various changes may be made in details of construction and `arrangement to suit the conditions of use of the machine and that the machine may be used for the cutting of external grooves as well as for the cutting of internal grooves.

I claim as my invention: In a machine for cutting grooves the com` bination of a work table, a rotary cutting tool above the table, a turbine for driving the cutting tool so arranged that impelling liquid discharged therefrom Will contact with the cutting tool to cool it and will fall onto the table, a tank forthe impelling liquid, means for withdrawing the impelling liquid from the tank and delivering it to the turbine, and means for conducting the impelling liquid discharged onto the table tothe tank. This specification signed this 19th day of July, A. D. 1927.

JEAN LAESSKER. 

